Wow, That guy claims to be ASE Master Certified for 16 years, but doesn't even know how to set tire pressure properly?!? ALWAYS set to the manufacturer recommended tire pressures with the tires cold. Best is in the morning before you have driven the vehicle. You should not drive the vehicle before setting the tire pressure to the manufacturer recommended setting! Check the tires cold, not hot. Set them to the manufacturer's recommended tire pressures that are posted on the tire information sticker on the door jamb. Igonore the tire's markings for pressures, those are for the tire only, and not for the vehicle. The vehicle manufacturer spent loads of money to test the vehicle and figure out what the best tire pressure would be for vehicle stability, fuel mileage, tire wear, and ride comfort. Changing from the recommended pressure can result in decreasing the stability of the vehicle, and increased tire wear. Sure, you can get a better ride by lowering the pressure, or increased fuel mileage by increasing the pressure, but is it worth risking losing control of the vehicle and getting into an accident for a lttle extra comfort, or a little bit of extra fuel mileage? Tires are a MAJOR safety component of the vehicle as they're the only thing that keeps the vehicle on the road! DO NOT MESS WITH CHANGING IT! Your life could depend on it! (Not to mention other people's lives!)
It's on the door post in the driver's door along with the tire size. It's also in the owner's manual. When you check pressure, You are suppose to check it in the morning or after the car sets for 30 minutes. The pressure is for cool tires, not hot. However, Sometimes this isn't practical after driving, so expect the pressure to be a few pounds higher if the tire is warm. Don't over inflate. This will cause possible lose of traction and tire wear.
For the best answers, search on this site https://shorturl.im/avuV3 This is because the tires originally fitted to your vehicle were built to the "Passenger Metric" sizing standard and are P195/65R15 89H while the replacement tires you have now were built to "European Metric" sizing standards (size 195/65R15 91H). Notice no "P" at the beginning of the size description and the different load index of 91 instead of 89. Dimensionally these tires are identical and interchangable but the way the load capacity (how much weight they can support) is figured is slightly different. At 30 psi for example the load capacity of the P195/65R15 89H is 1,190 pounds while for the 195/65R15 91H it is 1,179 pounds. This 11 pound difference in this case is not enough to get excited about so you can use the same inflation pressure without worry. Good question and a sharp eye. Most people would not have noticed the difference. ***EDIT*** Your welcome and I mean it. Very few people would have seen that difference and had enough sense to ask. It was an excellent question.
It's still 30 psi. The pressure on the tire is max pressure, including the pressure you will get from heat, which raises the tires air pressure.
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